Condensate eliminating means for silencers



June 22, 19371 F. E. DEREMER 2,084,435

' CONDENSATE' ELIMINATING MEANS FOR SILENCERS Filed Feb. 3, 1936 2 Sheets-Sheet l sum/C52 7 8W 5 A; INVENTOR ATTORNEY.

June 22, 1937. F, E DEREMER 2,084,435

GONDENSATE ELIMINATING MEANS FOR SILENCERS Filed Feb. 5, 1936 2 Sheets-Sheet 2 IN VENTOR.

BY a 0% M MORNEY.

Patented June 22, 1937 L NiTE t i We CONDENSATE ELEHENATKNG MEANS FOR SHILENCERS Appiication February 3, 1936, Serial. No. 62,042

6 t'liairns.

This application relates to silencers and more particularly to silencers used in connection with gases exhausted from internal combustion engines.

It has been discovered that exhaust gases include water vapor which condenses and causes the silencer to rust through and corrode, with consequent deleterious effects. As a remedy, it has been proposed to provide minute drain holes in the silencer, so that such condensate may drain out of the silencer. The provision of such holes, however, has been found to be objectionable.

It is therefore proposed by this invention to provide, in silencers, a different and more satisfactory means for preventing the gathering of condensate in silencers and this application dis closes the means thus proposed.

For an understanding of the means of this ap- 0 plication, reference should be had to the appended drawings which disclose silencers provided with means for preventing the gathering of condensate therein. In the drawings,

Fig. 1 shows in fragmentary sectional elevation a silencer whose outlet tube is provided with a fine tube for condensate elimination;

Fig. 2 is a similar view but showing a construction wherein the outlet end header is pro vided with a supplementary plate forming a condensate eliminating tube, and this figure is a section on line 2-2 of Fig. 3;

Fig. 3 is a section on line 3-3 of Fig. 2;

Fig. 4 shows a construction employing the means of Fig. l and wherein an intermediate header is formed to provide a passage for condensate from within the silencer to the elimination tube;

Fig. 5 is a section on line 55 of Fig. i;

Fig. 6 shows a construction wherein an outlet tube is formed to provide a condensate eliminating means;

Fig. 7 is a section as if on line l-'! of Fig. 6;

Fig. 8 shows a construction wherein the outer casing of the silencer is formed to provide a gathering pool or well into which a condensate elimination tube dips;

Fig. 9 is a section as if on line 9-43 of Fig. 8;

Fig. 10 shows a construction similar to that of F Fig. '7 but wherein the condensate elimination tube is disposed outside of the silencer instead of inside the same.

Referring to Fig. l of the drawings, it will be seen that the silencer there shown, which is r intended to be a three-pass silencer, such as is disclosed in the Oldberg Patent No. 2,018,084 of 01. lei-36) Gctober 2, i935, inciu'es an irnperforate outer casing it in which disposed three relatively spaced through-flow tubes somewhat shorter than the outer casing and connecting expansion chambers it at the opposite ends of the silencer through which pass extensions of two of the tubes, one of these extensions being intended as the i let tube and the other being intended as .ischarge tube it, which passes through the outlet end easier is understood that the discharged by the engine pass through the silencer in a retroverted path and are discharged from the silencer through the outlet tube it.

For preventing the gathering of condensate within the silencer, there is provided a tube it which con nunicates the expansion chamber 2 3 with the interior or" th outlet tube i i and which is provided with an open inlet end 3i and an open outlet end disposed substantially as indicated.

One explanation for the operation of this tube to perform desired function is as follows: The rush of exhaus" gas, at high velocity, through the outlet tube i l creates an aspirator action around the open outlet end of the tube 352 with the result that condensate in the lower part or" the expansion chamber 2 enters the inlet end iii of the tube and is expelled through the outlet end. of this tube.

Another explanation is as follows: It has been found that a pressure difference exists between the expansion chamber 2% and the outlet tube i l, and that this pressure difference is sufficient to cause condensate gathered in the lower part of the expansion chamber to rise in and be discharged through the tube iii.

In addition to the foregoing explanations the following explanations are also offered. It has been discovered that the means herein disclosed operates to atomize the condensate as it leaves the fine tube 32, and this is of advantage in constructions where the outlet tube M is connected to a tail pipe which is humped upwardly to pass over a frame or axle part of an automotive vehicle. Unless such atomization took place the efficient operation of the means herein disclosed might be impaired due to the inability of the condensate to pass over the tail pipe hump, in which case it would drain back into the silencer.

In Figs. 2 and 3 there is disclosed a modification wherein the i1 -e tube is replaced by a grooved plate welded to the outlet end header 26 so that its groove or channel it opens to the lower part of the silencer and communicates that part with the interior of the outlet tube l4 through an outlet tube aperture 42.

In Figs. 4 and 5 there is shown a detail of construction intended to be employed in conjunction with the construction disclosed in Fig. 1. Referring to Figs. 4 and 5, it will be seen that these figures disclose not only the parts disclosed in Fig. 1 but in addition an inlet tube 44 and an intermediate header 45, these being parts of the silencer disclosed in the aforementioned Oldberg Patent No. 2,018,084. To communicate the space 46 around the inlet tube 44 with the expansion chamber or space 41. between the headers 45 and 26, there is formed in the flange 48 of the header 45 a bead 49 which provides a channel 59 opening into the space 46 and the expansion chamber 41.

If desired, as is disclosed in Figs. 6 and 7, the outlet tube l4 may be disposed at the lower part of the casing 10 so that it may be formed with a bulge 5| dipping into the lower portion of the casing Ill and having an aperture 52 through which condensate gathered in the lower portion of the casing l0 flows upwardly into the outlet tube, from where it will escape to atmosphere through the tail pipe.

In Figs. 8 and 9 there is disclosed a construction wherein the fine tube 30 opening into the outlet tube l4 has its open lower end dipping into a well 53 formed in the outer casing ID of the silencer so that as much as possible of the condensate will gather in the well 53 from where it can flow upwardly through the tube 30 and out through the outlet tube l4 and the tail pipe of the silencer.

Fig. 10 shows a construction similar to Fig. 8 but wherein the fine tube 54 communicating the well 55 with the outlet tube 56 is disposed not inside the silencer as is the fine tube of Fig. 1 but outside of the same, being welded or otherwise secured against the outlet end header 51 and the casing 58 of the silencer, one end of the tube opening into the well 55 through the side thereof and the other end opening out into the outlet tube 55.

I claim:

1. In a silencer, means for eliminating condensate therein comprising a fine tube having its inlet in the lower part of the silencer casing and having its outlet in the outlet passage of the silencer.

2. In a silencer, means for eliminating condensate therein comprising a fine tube having its inlet in the lower part of the silencer casing and having its outlet in and directed along the outlet passage of the silencer.

3. In a three pass retroverted passage silencer, means for providing an expansion chamber at an end of the silencer, an outlet passage tube passing therethrough, and means for eliminating condensate therein comprising a fine tube having its inlet in the lower part of the expansion chamber and its outlet in the outlet passage tube.

4. In a three pass retroverted passage silencer, means for providing an expansion chamber at an end of the silencer, an outlet passage tube passing therethrough, and means for eliminating condensate therein comprising a fine tube having its inlet in the lower part of the expansion chamber and its outlet in and directed along the outlet 1 passage of the silencer.

5. In a silencer, an ejector for eliminating condensate therein having its inlet in the lower part of the silencer and its outlet in the outlet passage of the silencer.

6. In a silencer, an ejector for eliminating condensate therein having its inlet in the gathering point for condensate and its outlet in the path of the outletting exhaust gases of the silencer.

FLOYD E. DEREMER. 

